https://app.rakuten.co.jp/services/api/IchibaItem/Search/20220601?applicationId=b81babe0dea9170ecdaf3c019d8709b6&affiliateId=0433111a.0d75cb85.0433111b.a7f1907e&keyword=%E6%B5%B7%E5%A4%96%E3%82%AF%E3%83%A9%E3%83%96%E3%83%BB%E3%83%8A%E3%82%B7%E3%83%A7%E3%83%8A%E3%83%AB%E3%83%81%E3%83%BC%E3%83%A0%E3%82%B0%E3%83%83%E3%82%BA+%E3%82%A2%E3%83%BC%E3%82%BB%E3%83%8A%E3%83%AB+%E3%82%A2%E3%82%AF%E3%83%AA%E3%83%AB%EF%BC%92%E9%80%A3%E3%83%81%E3%83%A3%E3%83%BC%E3%83%A0%EF%BC%88%2318%EF%BC%89+%E3%82%B5%E3%83%83%E3%82%AB%E3%83%BC&format=json&formatVersion=2&hits=10&page=1&sort=standard

URL_rss=XMLを見てみる。

stdClass Object
(
    [GenreInformation] => Array
        (
        )

    [Items] => Array
        (
        )

    [TagInformation] => Array
        (
        )

    [carrier] => 0
    [count] => 0
    [first] => 0
    [hits] => 0
    [last] => 0
    [page] => 1
    [pageCount] => 0
)